I just recieved my new 15" DVC yesterday. I have found myself in a bit of a bind however. the only box I have aviable for it is a ported box that is only 5.25 cubic feet and tuned to 21hz. i am not in a position where i can build a new one right now so my delima is, should i stay with the ported setup or should I go ahead and close up the port and run it sealed at 5.25 cubic feet? sealed at 5.25 cubic feet would give me a Q of .60, which i think would sound pretty good actually. the next question is how worried should i be about over powering the driver since the amp driving it will be 675wrms? i could run the amp in stereo mode which would only give the sub about 300 - 400wrms total. thanks alot for taking a look!!